Adapt code of message fetch so that fetching of
(needaction) messages are controlled in a way to
keep continuous sequence of messages at all time.
This code design solves the "holes" problem in a message
list by not allowing holes. This fixes many scenario that
generated these holes, resulting in unfetchable messages.
Example of such a scenario:
- post 40 messages
- post a new message that is reply of the oldest message
- page reload and scroll up until load more
=> 10 messages are missing in-between replied message and
following message (that should have been 11 messages apart)
This code also prepares for allowing jumps in a conversation.
Part-of: odoo/odoo#116666
Alexandre Kühn
fc9d46f3b9